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Message #02689
Re: Bug in MAX() function?
Hello Benoit,
It might be useful to supply your table definitions. I did the following test and I can't find a problem. I am using 10.0.19-MariaDB.
CREATE TABLE t1
(
col1 INT, # have also tried defined as VARCHAR. No problem either.
col2 INT
);
INSERT INTO `t1` (`col1`, `col2`) VALUES('8','58');
INSERT INTO `t1` (`col1`, `col2`) VALUES('8','48');
INSERT INTO `t1` (`col1`, `col2`) VALUES('4','63');
INSERT INTO `t1` (`col1`, `col2`) VALUES('9','53');
INSERT INTO `t1` (`col1`, `col2`) VALUES('2','36');
INSERT INTO `t1` (`col1`, `col2`) VALUES('0','12');
INSERT INTO `t1` (`col1`, `col2`) VALUES('3','2');
INSERT INTO `t1` (`col1`, `col2`) VALUES('0','2');
INSERT INTO `t1` (`col1`, `col2`) VALUES('0','6');
INSERT INTO `t1` (`col1`, `col2`) VALUES('0','2');
INSERT INTO `t1` (`col1`, `col2`) VALUES('0','9');
INSERT INTO `t1` (`col1`, `col2`) VALUES('0','44');
INSERT INTO `t1` (`col1`, `col2`) VALUES('14','63');
INSERT INTO `t1` (`col1`, `col2`) VALUES('0','96');
INSERT INTO `t1` (`col1`, `col2`) VALUES('7','43');
INSERT INTO `t1` (`col1`, `col2`) VALUES('4','66');
INSERT INTO `t1` (`col1`, `col2`) VALUES('2','43');
INSERT INTO `t1` (`col1`, `col2`) VALUES('2','66');
INSERT INTO `t1` (`col1`, `col2`) VALUES('0','63');
INSERT INTO `t1` (`col1`, `col2`) VALUES('6','48');
INSERT INTO `t1` (`col1`, `col2`) VALUES('2','52');
SELECT col1, col2, col1 + col2
FROM t1;
# Correctly returns 96
SELECT MAX(col1 + col2)
FROM t1;
Cheers,
Rhys
-----Original Message-----
From: Maria-discuss [mailto:maria-discuss-bounces+rhys.campbell=tradingscreen.com@xxxxxxxxxxxxxxxxxxx] On Behalf Of Benoit Panizzon
Sent: 19 June 2015 09:59
To: maria-discuss@xxxxxxxxxxxxxxxxxxx
Subject: [Maria-discuss] Bug in MAX() function?
Hi all
I stumbled over that problem, while trying to graph mail traffic..
I have two different counters for emails sent with authentication and without.
Aggregated per hour.
I would like to total the both values per row, to create a graph of outgoing emails per hour.
MariaDB [maildb]> select mail_out_anon,mail_out_auth from domaincounters;
+---------------+---------------+
| mail_out_anon | mail_out_auth |
+---------------+---------------+
| 8 | 58 |
| 8 | 48 |
| 4 | 63 |
| 9 | 53 |
| 2 | 36 |
| 0 | 12 |
| 3 | 2 |
| 0 | 2 |
| 0 | 6 |
| 0 | 2 |
| 0 | 9 |
| 0 | 44 |
| 14 | 63 |
| 0 | 96 |
| 7 | 43 |
| 4 | 61 |
| 2 | 43 |
| 2 | 66 |
| 0 | 86 |
| 6 | 77 |
| 6 | 55 |
| 0 | 63 |
| 6 | 48 |
| 2 | 52 |
+---------------+---------------+
> select mail_out_anon+mail_out_auth as mail_out_total from
> domaincounters;
+-----------------------------+
| mail_out_anon+mail_out_auth |
+-----------------------------+
| 70 |
| 56 |
| 67 |
| 62 |
| 38 |
| 12 |
| 5 |
| 2 |
| 6 |
| 2 |
| 9 |
| 44 |
| 77 |
| 96 |
| 50 |
| 65 |
| 45 |
| 68 |
| 86 |
| 83 |
| 61 |
| 63 |
| 54 |
| 54 |
+-----------------------------+
Now I need the max value of that addition to auto-scale the graph.
MariaDB [maildb]> select MAX(mail_out_anon+mail_out_auth)
+----------------------------------+
| MAX(mail_out_anon+mail_out_auth) |
+----------------------------------+
| 187 |
+----------------------------------+
What did MariaDB count here? I was expecting a value 96 which is the largest value of all the additions.
Also trying various ways of first using GREATEST() always returns a way to high value.
Is it a bug, or did I do something wrong?
Mit freundlichen Grüssen
Benoit Panizzon
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